Author Question: A rod (length = 10 cm) moves on two horizontal frictionless conducting rails, as shown. The magnetic ... (Read 134 times)

EAugust · **on:** Jul 28, 2018

A rod (length = 10 cm) moves on two horizontal frictionless conducting rails, as shown. The magnetic field in the region is directed perpendicularly to the plane of the rails and is uniform and constant. If a constant force of 0.60 N moves the bar at a constant velocity of 2.0 m/s, what is the current through the 12- load resistor?

a.
0.32 A

b.
0.34 A

c.
0.37 A

d.
0.39 A

e.
0.43 A

Question 2

In the arrangement shown, a conducting bar of negligible resistance slides along horizontal, parallel, frictionless conducting rails connected as shown to a 2.0- resistor. A uniform 1.5-T magnetic field is perpendicular to the plane of the paper. If L = 60 cm, at what rate is thermal energy being generated in the resistor at the instant the speed of the bar is equal to 4.2 m/s?